GB/T 3215-1982 General technical specifications for centrifugal pumps for refineries, chemical and petrochemical processes

This standard applies to centrifugal pumps used in refineries, chemical industry and petrochemical industry processes. GB/T 3215-1982 General technical requirements for centrifugal pumps used in refineries, chemical industry and petrochemical industry processes GB/T3215-1982 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
General Technical Specifications for Centrifugal Pumps for Refinery, Chemical and Petrochemical Processes
Centrifugal Pumps for Refinery, Chemical and Petrochemical Processes General Technical Specifications This standard applies to centrifugal pumps for refinery, chemical and petrochemical processes. If the user has special requirements for the product outside the provisions of this standard, it shall be implemented according to the order and data sheet. UDC621.65:68
GB3215-82
Manufacturing! 'An alternative design that is different from the standard design and can meet the requirements of this standard can be provided, but the differences should be explained. 1 Terminology
a. Allowable operating range
The flow range generated by the impeller installed on the pump at the specified speed, operating temperature, upper operating pressure and specific gravity, and is limited by cavitation, heat, vibration, noise, shaft deflection and other conditions. This range should be determined by the manufacturer! Regulations. b. Pump NPSH,
Pump NPSH is the surplus energy required to exceed the vapor pressure per unit weight of liquid at the pump inlet, determined by the manufacturer, converted to a value of meter liquid column on the reference surface. c: Effective NPSH,
Effective NPSH is also called device NPSH, which is determined by the user based on the pump device system. It is the surplus energy required to exceed the vapor pressure per unit weight of liquid at the pump inlet, converted to a value of meter liquid column on the reference surface. d; Maximum allowable continuous speed
The maximum speed allowed by the manufacturer for continuous operation of the pump. e. Shaft turbulence
The term "shaft turbulence" used in this standard refers to the radial pressure of the impeller on the impeller caused by the liquid. The displacement of the shaft from its geometric center due to the action of force. This displacement does not include the displacement caused by the swing caused by the bearing clearance, the bending caused by the impeller imbalance or the radial runout of the shaft. f. Corrosion margin
The part where the wall thickness of the part in contact with the pumped medium exceeds the theoretical wall thickness of the part to withstand the working pressure. B. Circulating fluid
The ejected liquid is led from the high-pressure area to the shaft seal chamber through an external pipeline or an internal channel, which can eliminate the heat generated by the shaft seal, maintain the positive pressure in the shaft seal chamber or improve the working conditions of the shaft seal. For some cases, it is best to circulate from the shaft seal chamber to the low-pressure area (such as the inlet). h. Introducing fluid
Introduce appropriate (clean, no effect on the pumped medium) liquid into the shaft seal chamber from an external source, and then Into the pumped liquid. The injection liquid and the circulating liquid have the same function.
1. Isolation liquid
Appropriate (clean, no effect on the pumped medium) liquid introduced between the two shaft seals (mechanical seals or soft packings). The pressure of the isolation liquid depends on the shaft seal device. Isolation liquid can be used to prevent air from entering the pump. Isolation liquid is generally easier to seal than the pumped liquid, and it is less likely to cause danger if it leaks.
j: Cleaning liquid
National Bureau of Standards 1982-10-08 Issued
1983-06-01 Implementation
GB8215-82
Appropriate (clean, no effect on the pumped medium) liquid introduced continuously or intermittently on the atmospheric side of the main shaft seal. Used to isolate air and moisture: prevent or eliminate sediment (including ice), lubricate auxiliary shaft seals, eliminate fire sources, dilute, heat or cool leaked liquid. 2 Design
2.1 Pump performance
The pump manufacturer shall determine the permissible operating range of the pump and its variants and provide performance curves (curves of the relationship between head, efficiency, auxiliary power, NPSH, etc. and flow rate).
The pump design should take into account the possibility that at rated speed, after replacing the impeller with the largest diameter, the head can be increased by at least 5% under rated conditions.
The NPSH of the pump should not be greater than the specified value.
If the pump manufacturer considers that a larger NPSH is required due to the requirements of the material and the pumped medium, this should be stated in the proposal and in the curves provided.
2.3 Prime mover
2.3.1 Factors to be considered in selecting the power of the prime mover The power selection of the prime mover should consider:
Friction loss of the shaft seal,
Characteristics of the pumped medium (viscosity, specific gravity, etc.),
Only one pump is working in the parallel pump system, the atmospheric pressure on site,
The position of the working point of the system on the performance curve; transmission loss.
Primary mover power
The prime mover power ratio must be at least equal to the percentage (ordinate) of the rated shaft power (abscissa) of the pump shown in the figure below. 130
Rated shaft power of the pump
2.3.2.2 When the pump is driven by a motor and a steam turbine, the rated power of the motor should be sufficient to drive the pump operating under rated conditions and the steam turbine without cooling steam entering.
2.3.2.3 When the pump is driven by a motor and a steam turbine, the rated power of the steam turbine shall be sufficient to drive the pump and the motor under rated conditions.
2.3.2.4 When the steam turbine is used as the prime mover, the rated power of the steam turbine shall be based on the specified minimum steam inlet conditions and maximum exhaust pressure at the turbine inlet.
2.3.3 The axial force shall be considered in the drive of vertical pumps. GB3215—82
If the axial force of the vertical pump is borne by the motor or the gear transmission device, it shall be designed to withstand the maximum upward and downward thrust that may be generated by the pump during starting, stopping and operation. 2.4 Maintenance speed
The shafts of single-stage pumps and two-stage pumps shall be rigid. The maximum allowable continuous speed n of the shaft is less than the first critical speed nc1, and should be taken as 0.8nelwwW.bzxz.Net
For pumps with flexible shafts, the maximum allowable continuous speed n of the shaft is greater than the first critical speed nc1 but less than the second critical speed ne2, and should be taken as 1.4nc1
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